Eur. Phys. J. C 27, 427-432 (2003)
DOI: 10.1140/epjc/s2002-01124-0

Delineating the polarized and unpolarized photon distributions of the nucleon in eN collisions

M. Glück, C. Pisano, E. Reya and I. Schienbein

Universität Dortmund, Institut für Physik, 44221 Dortmund, Germany

(Received: 2 October 2002 / Revised version: 9 December 2002 / Published online: 14 February 2003 )

Abstract
The production rates of lepton-photon and dimuon pairs at the HERA collider and the HERMES experiment are evaluated in the leading order equivalent photon approximation. It is shown that the production rates are sufficient to facilitate the extraction of the polarized and unpolarized equivalent photon distributions of the proton and neutron in the available kinematical regions. It is pointed out that these results indicate the possibility of additional, independent, tests concerning the unpolarized and polarized structure functions F_1,2^N and g_1,2^N, respectively, of the nucleon.

© Società Italiana di Fisica, Springer-Verlag 2003